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Method and apparatus for controlling air-fuel ratio in internal combustion engine

  • US 5,179,924 A
  • Filed: 05/31/1991
  • Issued: 01/19/1993
  • Est. Priority Date: 06/01/1990
  • Status: Expired due to Term
First Claim
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1. A method of controlling air-fuel ratio of a gas mixture of air and fuel supplied to an internal combustion engine, in which an actual air-fuel ratio is determined on the basis of exhaust gas components of said engine by using air-fuel ratio detecting means installed in an exhaust gas system of said engine, the air-fuel ratio of said gas mixture to be supplied to said engine being controlled through a feedback control on the basis of deviation of said actually determined air-fuel ratio from a reference value thereof, said control method comprising a step of making a decision as to performance of said air-fuel ratio detecting means by making use of a change in the air-fuel ratio detection output of said air-fuel ratio detecting means at the time of at least one of interruption and restart of the fuel supply to said internal combustion engine.

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